Stephanie began her role on The Hills in Season 3, in 2007, as Spencer's angry sister who confronts Lauren Conrad. She eventually apologized to Lauren and became one of her close friends, causing a rift between her and Spencer. In Season 4, Stephanie gained more of a major role, showing her love life and family life, even mentioning her past drug abuse. In Season 5, Stephanie worked with Lauren at People's Revolution, until she was later fired by Lauren Conrad (on Kelly Cutrone's saying). Pratt became close friends with Audrina and Lo following Conrad's departure and Kristin Cavallari's new role in the series.